Adjustable seat



`hun@ 16, 1936. H. M. ERWIN ADJUSTABLE SEAT Filed March 5, 1936 f n//////,.A

d' '3mm HMEJ" c Stimmung/4 Patented June 16, 1936 UNITED STATES PATENTOFFICE Y Y. 2,044,675 Y ADJUSTABLE SEAT Y Hugh Milton Erwin, Dallas,Tex. Application March 5, 1936, Serial No. 67,357

Y Claims. (Cl. 155-95) The invention forming the subject matter of this`application relates to chairs, or similar supports, in which the seatmay be elevated and rotated upon its axis to any desired position to 5suit the convenience of the operator.

The object of the invention is toprovide a support with a seat capableof being raised and lowered relative to the support, and lockedfrictionally in any desired angular position in the support. l

Other objects of the invention will become apparent as the detaileddescription thereof proceeds.

In the drawing:

Figure 1 is a perspective view of a seat embodying the presentinvention;

Figure 2 is a vertical section of the seat taken on the line 2-2 ofFigure 1; and

Figure 3 is a section taken on the line 3-3 of Figure 2. Y

As shown in the drawing, the invention comprises a substantiallyrectangular base member I having a bottom 2, end walls 3 and 4, a frontwall 5, and a rearrwall 6. A partition 1 is suitably secured to walls ofthe base member substantially parallel to the bottom 2, and slightlybelow the top edges of the walls of the member I.

A rectangular casing 8 isseated on the partition 1 in the recess formedthereby with the walls of the base member. The casing 8 is pro- ISOvided with a top 9 provided with two circular Y apertures I0 and I I,the edges of which are bent to seat in recesses formed in the upperedges of the frusto-conical seat members I2 and I3, respectively. Thesemembers I2 and I3 form locking supports for the frusto-conical casingsI4 and I5, respectively. g

Each of the casings I4 and I5 has suitably secured thereto a plate I6forming a support for the springs I1 which are covered by circular sheetI8 of flexible material, such as is commonly used in upholstered chairs.The edges of these sheets are suitably secured in the recessed upperedges of the casings I4 and I5.

The casings I4 and I5 normally iit snugly in the members I2 and I3 andare prevented from rotation therein by their friction fit. The seatsformed by the casings I4 and I5 and their associated cushions, areadapted to be raised bodily from locked contact with their supportingmem bers I2 and I3,'and to be rotated about substantially vertical axes.For this purpose, a shaft I9 is mounted to rotate in bearings 20 and 2Isecured in the end walls 3 and 4. 55 Cams 22 are suitably secured tolshaft I9 directly below the centers of the cushion seats; and each camsupports a rod 23 mounted to slide through an aperture 24 in thepartition 1. A vertical guide 25 clamped to the partition 1 receives therod 23 snugly and slidably to ensure rotation of the cushioned seatabout the. axis of the frusto-conical members. The upper end of the rod23 is provided with a heavy iiange 26 which is fixed to the plate I6.

In order toeffect raising and lowering of the rods 23, and the seatssupported thereby, the shaft I9 has a crank arm 21 projecting radiallyfrom the center thereof. A link 28 is pivotally connected at one end tothe end of the arm 21; and, at its other end is pivoted to one end of alever 29. The lever 29 is pivoted between its ends to a bracket 30 xedto the front wall 5 of the base member I.

The cams 22 are shaped and arranged on shaft I9 so that the cushionedseats are in lowered and locked position when the lever 29 lies invertical position, as shown in full lines in Figure 3. A swing of thelever to the position shown by the dotted lines in Figure 3 rotates theshaft I9, and the cams thereon, so as to raise the seats out of lockedcontact with the seat members I2 and I3. In raised position the seatsmay be rotated freely about their vertical axes to suit the convenienceof the persons using them.

What I claim is:

1. A base provided with a conical recess, a rod slidable and rotatableon said base coaxially with said recess, a seat fixed to one end of saidrod and normally resting in said recess, and meansY connected to theother end of said rod to raise the seat from said recess.

2. A base member having a frusto-conical recess formed therein, a guideon said base member having a bore coaxial with said recess, a rodmounted to slide and rotate in said bore, a seat fixed to one end ofsaid rod and having a frustoconical periphery adapted to fit and belocked in said recess when the rod is in lowered position in said guide,and means for raising said rod fromA lowered position to move the seatfrom said recess and permit rotation thereof.

3. A base member having a frusto-conical recess formed therein, a guideon said base member having a bore coaxial with said recess, a rodmounted to slide and rotate in said bore, a seat fixedV to one end ofsaid rod and having a frustoconical periphery adapted to iit and belocked in said recess when the rod is in lowered position in said guide,a shaft rotatable in said base member, a cam on said shaft supportingsaid rod,

and means for rotating said shaft to effect release of the seat fromlocked position in said recess.

4. A base member having a frusto-conical recess formed therein, a guideon said base member having a bore coaxial with said recess, a rodmounted to siide and rotate in said bore, a seat xed to one end of saidrod and having a frustoconical periphery adapted to t and be locked insaid recess When the rod is in lowered position in said guide, a shaftrotatable in said base member, a cam on said shaft supporting said rod,a lever fulcrumed on said base member, and means connecting said leverto said shaft to rotate said shaft.

5. A base member havingV a frusto-concal recess formed therein, a guideon said base member having a bore coaxial with said recess, a rodmounted to slide and rotate in said bore, a seat xed to one end of saidrod and having a frustoconical periphery adapted to fit and be locked insaid recess when the rod is in lowered position in said guide, a shaftrotatable on said base member, a cam on said shaft supporting said rod,a crank arm extending radially from said shaft, a lever fulcrumed onsaid base member, and alink pivotally connecting said crank arm to saidlever to effect rotation of said shaft.

